Exception when Clip = true for WMS source

[ghost]

When a WMS source is configured with "Clip = true", and a bounding box extent for the source, an exception occurs:

Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/mapproxy/wsgiapp.py", line 193, in call resp = self.handlers[handler_name].handle(req) File "/usr/lib/python2.7/dist-packages/mapproxy/service/ows.py", line 38, in handle return self.services[service].handle(req) File "/usr/lib/python2.7/dist-packages/mapproxy/service/base.py", line 30, in handle return handler(parsed_req) File "/usr/lib/python2.7/dist-packages/mapproxy/service/wms.py", line 142, in map bbox=query.bbox, bbox_srs=params.srs, coverage=coverage) File "/usr/lib/python2.7/dist-packages/mapproxy/image/merge.py", line 84, in merge img = mask_image(img, bbox, bbox_srs, layer_coverage) File "/usr/lib/python2.7/dist-packages/mapproxy/image/mask.py", line 33, in mask_image geom = mask_polygons(bbox, SRS(bbox_srs), coverage) File "/usr/lib/python2.7/dist-packages/mapproxy/image/mask.py", line 42, in mask_polygons return flatten_to_polygons(coverage.geom) File "/usr/lib/python2.7/dist-packages/mapproxy/util/geom.py", line 248, in flatten_to_polygons if geometry.type == 'Polygon': AttributeError: 'NoneType' object has no attribute 'type' [info] 127.0.0.1 - - [11/Feb/2019 16:19:10] "GET /service?service=WMS&request=GetMap&version=1.3.0&crs=EPSG:4326&layers=CIB-NY&styles=&transparent=TRUE&format=image/png&width=512&height=512&bbox=44.15625,-75.09375,44.4375,-74.8125 HTTP/1.1" 500 -

Config file contains:

layers:

• name: CIB-NY title: CIB-NY sources: [cib_cache]

caches: cib_cache: grids: [gridCIB] sources: [cibny_source] cache: type: mbtiles

sources: cibny_source: type: wms wms_opts: featureinfo: True req: url: http://localhost/cgi-bin/mapserv? layers: CIBNYI7k transparent: true format: image/tiff coverage: clip: true bbox: [-75.5086294, 43.9872123, -74.9969543, 44.5120205] srs: 'EPSG:4326' supported_srs: ['EPSG:4326']

Context

In mapproxy/image/merge.py, at line 83, if 'layer_coverage.clip' is true, 'mask_image' is called with 'layer_coverage' defined to be a bounding box object. But eventually, 'layer_coverage.geom' is referenced, and it's not defined.

Your Environment

• Version used: 1.11
• Environment name and version: Python 2.7.15
• Server type and version: Apache2 2.4.29, libapache2-mod-wsgi 4.5.17-1
• Operating System and version: Ubuntu 18.04

[GeOSMRob]

I also have the same bug with coverages with intersection at WMS sources.

    coverage:
      clip: true
      intersection: [*data_src_test, *data_src_test2]

Is it possible when seeding or calling that an empty tile is created? When seeding, the task will be skipped if the result is empty in the intersection?

[kom177]

I've found the same issue on Ubuntu 20.04, Python 3.8 and Mapproxy 1.15.1. Is there any solution?